Journal articles: 'Matt Fraction'

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Usieto, Borja. "Reseña de "Ojo de Halcón 1. Seis días en la vida de…" de Matt Fraction, David Aja, Javier Pulido, Matt Hollingsworth." CuCo, Cuadernos de cómic, no. 1 (September 1, 2013): 307–13. http://dx.doi.org/10.37536/cuco.2013.1.1121.

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Bartual, Roberto. "Reseña de "F.F. 1. Partes de un hueco" de Matt Fraction, Mike Allred y Laura Allred." CuCo, Cuadernos de cómic, no. 2 (April 30, 2014): 236–39. http://dx.doi.org/10.37536/cuco.2014.2.1311.

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Haniq, Ummu. "KESULITAN SISWA DALAM MENYELESAIKAN SOAL MATEMATIKA MATERI PECAHAN PADA SISWA KELAS V SDN 188 PEKANBARU." Primary: Jurnal Pendidikan Guru Sekolah Dasar 8, no. 1 (April 23, 2019): 56. http://dx.doi.org/10.33578/jpfkip.v8i1.7052.

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This research is motivated by a large number of students who have difficulty in solving mathematical problems of with fractions. This research aims to find out and describe the difficulties experienced by a student in solving mathematical problem infraction. This type of research is qualitative research. This Study found that the difficulties experienced by students in solving fractions are difficulty in understanding the concept of fractional counting operations, difficulty because it does not master multiplication as preparatory material, and difficulty in solving problem-solving problems in fractions. Internal factors that cause students to have difficulty in solving math problems in the fraction are low student motivation, students don’t like math and low ability of students in mathematics. External factors that cause students to experience difficulties in fraction learning are unfavorable class conditions and poor classroom management.

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Dyderski, Marcin K., and Andrzej M. Jagodziński. "Functional traits of acquisitive invasive woody species differ from conservative invasive and native species." NeoBiota 41 (January 31, 2019): 91–113. http://dx.doi.org/10.3897/neobiota.41.31908.

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One of the most important sources of invasiveness is species’ functional traits and their variability. However there are still few studies on invasive tree species traits conducted along resource gradients that allow for a comparison of acquisitive and conservative strategies. We aimed to assess the differences in trait variation among native alien conservative and alien acquisitive tree species along resource availability gradients (soil fertility and light availability) and to assess the traits variability of the species studied along resources availability gradients. Our study compared invasive tree species in Europe (Prunusserotina Ehrh. Quercusrubra L. and Robiniapseudoacacia L.) with their native competitors (Acerpseudoplatanus L. A.platanoides L. Quercuspetraea (Matt.) Liebl. and Fagussylvatica L.). The study was conducted on 1329 seedlings and saplings collected in a system of 372 study plots in W Poland. For each individual we assessed leaf stem and root mass ratios total biomass leaf area ratio specific leaf area and projected leaf area. Two invasive species (P.serotina and R.pseudoacacia) represented a more acquisitive strategy than native species – along litter pH and light availability gradients these species had higher leaf mass fraction specific leaf area and leaf area ratio. In contrast Q.rubra had the highest total biomass and root mass fraction. Alien species usually had higher coefficients of variation of studied traits. This suggests that relatively high projected leaf area as a way of filling space and outcompeting native species may be reached in two ways – biomass allocation to leaves and control of leaf morphology or by overall growth rate. High variability of invasive species traits also suggests randomness in seedling survival which similarly to the neutral theory of invasion highlights the necessity of including randomness in modelling biological invasions.

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Zolides, Andrew. "Lipstick Bullets: Labour and Gender in Professional Gamer Self-Branding." Persona Studies 1, no. 2 (October 30, 2015): 42–53. http://dx.doi.org/10.21153/ps2015vol1no2art467.

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With the growing professionalisation of electronic sports (or e-sports), the individuals who compete are, like their more “traditional” sport counterparts, becoming celebrities. Actual competition is a fraction of the labour a professional gamer undertakes to earn a living and generate a self-brand—there are also complex arrangements involving sponsorships, team-memberships, and digital reputation management. Indeed, taking part in e-sports can be understood as another mode of celebrity-creation within a particular fan community. A key vector to the persona formation of professional gamers is gender. Female professional gamers must navigate additional hurdles in the creation and management of their brand and attempts to commoditise their personas. Female gamers carefully negotiate and perform their gender while maintaining their status as a competitor and influencer in gaming’s highly masculinised culture. This performativity places these young women in a precarious position not just in terms of economic stability, but also in terms of their gendered identity. This paper compares the online personas of professional gamers Matt “NaDeSHoT” Haag and Kelly “MrsViolence” Kelley, analysing their social media presences and mainstream media appearances. Reframing the labour of professional gamers as one of building a commodifiable work persona can help us better understand the economically precarious position in which professional gamers, particularly young women, find themselves.

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Rejšek, K., O. Haveraaen, A. Sandnes, and K. Somerlíková. "Soil characteristics under selected broadleaved tree species in East Norway." Journal of Forest Science 56, No. 7 (July 26, 2010): 295–306. http://dx.doi.org/10.17221/86/2009-jfs.

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Comprehensive analyses of soil properties of sites of native Scandinavian broadleaved tree species were performed in 36 habitats in East Norway. The material consisted of stands of silver birch (Betula pendula Roth.), white birch (Betula pubescens Ehrh.), black alder (Alnus glutinosa Gaertn.), speckled alder (Alnus incana Moench.), European ash (Fraxinus excelsior L.), pedunculate oak (Quercus robur L.) and sessile oak (Quercus petraea [Matt.] Liebl.). The main objective was to describe the vertical characteristics and variations in some selected soil variables of the soil profiles. Particular soil horizons of 15 Brunisolic soils, 11 Regosolic soils, 6 Gleysolic and 4 Podzolic were sampled and analyzed for soil texture, bulk density, specific density, porosity, oxidizable carbon, total nitrogen content, pH in water, exchangeable acidity, exchangeable cations and anions (Mg, Ca, Mn, Al, S, Fe, B, P and K), cation exchange capacity and base saturation. No regular patterns were found in selected soil properties when tested between various soil units in silver birch stands. Furthermore, silver birch stands were found on sites, which topsoil (i) significantly differed in their cation exchange capacities, (ii) did not differ significantly in their pH values, and (iii) mostly differed in their clay contents and (iv) mostly did not differ in BS. Differences among the Humic Regosols, Luvic Gleysols, Sombric Brunisols, Eutric Brunisols and Humo-Ferric Podzols for silver birch stands in their topmost horizons of humified organic matter intimately mixed with the mineral fraction horizons and differences among particular soil horizons for the main soil properties under all the selected broadleaved tree species stands are discussed.  

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Sun, Yu, and Jun Wu. "A dimensional result in continued fractions." International Journal of Number Theory 10, no. 04 (May 21, 2014): 849–57. http://dx.doi.org/10.1142/s179304211450002x.

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Given x ∈ (0, 1), let [a1(x), a2(x), a3(x),…] be the continued fraction expansion of x and [Formula: see text] be the sequence of rational convergents. Good [The fractional dimensional theory of continued fractions, Math. Proc. Cambridge Philos. Soc.37 (1941) 199–228] discussed the growth properties of {an(x), n ≥ 1} and proved that for any β > 0, the set [Formula: see text] is of Hausdorff dimension [Formula: see text]. In this paper, we consider, for any β > 0, the set [Formula: see text] and show that the Hausdorff dimension of F(β) is [Formula: see text].

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Mailani, Elvi, Akden Simanihuruk, and Imelda Free Unita Manurung. "THE DEVELOPMENT OF MATHEMATICS TEACHING MEDIA ‘OPUNG HANS’ BASED ON IAI." Journal of Community Research and Service 3, no. 2 (December 24, 2019): 82. http://dx.doi.org/10.24114/jcrs.v3i2.15955.

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The aim of this research is to develop a media for learning mathematics in "Opung HAN" elementary school based on Interactive Audio Instruction (IAI) for students majoring in UNIMED elementary school teacher education. The IAI-based "Opung HAN" fraction media was compiled based on observations during the learning and analysis conducted on the dictates of high-class mathematics education courses and interviews conducted with elementary school teacher education students, where teachers were very difficult to convey material related to fractions, The teacher does not know what media to use in teaching broken material. On the other hand, in the high school mathematics education textbook, there is also no media / teaching aids that can be used to teach fractional material. The specific purpose of this research is: developing IAI-based "Opung HAN" fraction media which will later be used by students majoring in primary school teacher education in teaching fraction material when they later become a teacher. This research uses development research (Developmental Research). The subjects of this study were students majoring in primary school teacher education at the State University of Medan. In the initial stage, observations were made during the learning process, analysis of the dictates of high-level mathematics education courses and continued with interviews with students. From the results of these observations and interviews, an initial draft of the IAI-based "Opung HAN" fraction was compiled. Furthermore, the initial design of the IAI-based "Opung HAN" fraction media was validated by a team that aimed to assess the quality of these elementary mathematics learning media fractions so that the fractional media became effective learning media which would later be used by lecturers and students in the lecture process.Keywords : IAI, Fraction media, math learning.

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Mousley, Keith, and Ronald R. Kelly. "Developing Deaf Students Fraction Skills Requires Understanding Magnitude and Whole Number Division." Journal of Education and Learning 7, no. 2 (December 21, 2017): 12. http://dx.doi.org/10.5539/jel.v7n2p12.

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Research has shown that fraction magnitude and whole number division are important precursors to learning and understanding fractions. Deaf and hard-of-hearing (DHH) students are consistently challenged with learning fractions from K-12 through college. Sixty DHH college students were tested for both their understanding of magnitude between two fractions and their ability to calculate whole number division. The results showed that both understanding the magnitude between two fractions and whole number division are significantly associated with accurately calculating arithmetic functions of fractions with like denominators and different denominators that required them to add, subtract, multiply, and divide two fractions. Understanding fraction magnitude and whole number division were also significantly associated with their self-rated confidence of math performance with fractions. Tangentially, DHH college students’ English reading ability was significantly, but modestly associated with their fraction performance.

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CELLAROSI, FRANCESCO. "Renewal-type limit theorem for continued fractions with even partial quotients." Ergodic Theory and Dynamical Systems 29, no. 5 (February 3, 2009): 1451–78. http://dx.doi.org/10.1017/s0143385708000825.

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AbstractWe prove the existence of the limiting distribution for the sequence of denominators generated by continued fraction expansions with even partial quotients, which were introduced by Schweiger [Continued fractions with odd and even partial quotients. Arbeitsberichte Math. Institut Universtät Salzburg4 (1982), 59–70; On the approximation by continues fractions with odd and even partial quotients. Arbeitsberichte Math. Institut Universtät Salzburg1–2 (1984), 105–114] and studied also by Kraaikamp and Lopes [The theta group and the continued fraction expansion with even partial quotients. Geom. Dedicata59(3) (1996), 293–333]. Our main result is proven following the strategy used by Sinai and Ulcigrai [Renewal-type limit theorem for the Gauss map and continued fractions. Ergod. Th. & Dynam. Sys.28 (2008), 643–655] in their proof of a similar renewal-type theorem for Euclidean continued fraction expansions and the Gauss map. The main steps in our proof are the construction of a natural extension of a Gauss-like map and the proof of mixing of a related special flow.

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Chuang, C. N., M. Tanner, M. C. Chen, S. Davidson, and A. H. Soll. "Gastrin induction of histamine release from primary cultures of canine oxyntic mucosal cells." American Journal of Physiology-Gastrointestinal and Liver Physiology 263, no. 4 (October 1, 1992): G460—G465. http://dx.doi.org/10.1152/ajpgi.1992.263.4.g460.

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Using enzyme-dispersed canine oxyntic mucosal cells, we studied regulation of histamine release from fractions in which mast cells were largely removed by density gradient. Histamine-like immunoreactivity was demonstrated using peroxidase-anti-peroxidase immunohistochemistry. Histamine-containing cells in the small cell elutriator fractions (SCEF) were further separated by albumin step density gradients. Approximately 2.5% of cells in the low density fraction (LDF) contained histamine-like immunoreactivity; this fraction was largely depleted of the more dense mast cells (0.5%). These two fractions were cultured for 48-64 h on a Matrigel substrate. The cell content of histamine and release into the medium were measured by radioenzymatic assay. Gastrin, carbachol, and forskolin increased histamine release from the LDF. The induction of histamine release by gastrin was evident within 5 min and was sustained for at least 60 min. The response to gastrin was dose dependent between concentrations of 10(-11) and 10(-8) M. In contrast, in the mast cell-enriched SCEF, basal release was higher and gastrin was without effect; however, concanavalin A stimulated and epinephrine inhibited histamine release indicating that histamine-release mechanisms were intact in this fraction. Our methods provide a preparation of low density oxyntic mucosal histamine cells that demonstrate gastrin-responsive histamine release; we speculate that enterochromaffin-like cells account for this gastrin response.

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LELIS, JEAN, and DIEGO MARQUES. "ON A PROBLEM OF ERDÖS AND MAHLER CONCERNING CONTINUED FRACTIONS." Bulletin of the Australian Mathematical Society 95, no. 2 (October 19, 2016): 183–86. http://dx.doi.org/10.1017/s0004972716000770.

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In 1939, Erdös and Mahler [‘Some arithmetical properties of the convergents of a continued fraction’, J. Lond. Math. Soc. (2)14 (1939), 12–18] studied some arithmetical properties of the convergents of a continued fraction. In particular, they raised a conjecture related to continued fractions and Liouville numbers. In this paper, we shall apply the theory of linear forms in logarithms to obtain a result in the direction of this problem.

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Carneiro, C. C., J. Holanda Véras, B. R. Lima Góes, C. N. Pérez, and L. Chen-Chen. "Mutagenicity and antimutagenicity of Salacia crassifolia (mart. Ex. Schult.) G. Don. evaluated by Ames test." Brazilian Journal of Biology 78, no. 2 (September 21, 2017): 345–50. http://dx.doi.org/10.1590/1519-6984.166593.

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Abstract Salacia crassifolia (Mart. Ex. Schult.) G. Don. is a bush which belongs to Celastraceae family and occurs specially in Brazilian Cerrado. Its leaves, stem, seeds and fruits are popularly used for several medicinal purposes, such as antitumoral, antirheumatic, anti-inflammatory and antimicrobial. In this study, the mutagenic and antimutagenic activities of S. crassifolia stem bark fractions (hexane, ethyl acetate and hydroalcoholic) were evaluated by the Ames mutagenicity assay in Salmonella typhimurium TA98 and TA100 strains. By the obtained results, all S. crassifolia fractions did not significantly increase the number of prototrophic revertants for histidine (His+) in both S. typhimurium strains tested (p > 0.05), suggesting absence of mutagenicity. Regarding antimutagenicity, the fractions ethyl acetate and hydroalcoholic significantly decreased the number of His+ revertants colonies induced by positive control for strain TA98 (p < 0.05), demonstrating protection against mutagenicity induced by 4-nitroquinolile1-oxide, whereas the hexane fraction did not show antimutagenic effect in this strain. In the TA100 strain, all fractions of S. crassifolia protected DNA against the harmful action of sodium azide, and the hexane fraction exhibited the greatest protection in this work. Thus, it’s possible conclude that the fractions of S. crassifolia tested in this study could be used in chemoprevention.

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Alves, Dejane Santos, Reinaldo Chico Morejón, Alan Rodrigues Teixeira Machado, Geraldo Andrade Carvalho, Oriela Pina, and Denilson Ferreira Oliveira. "Acaricidal activity of Annonaceae fractions against Tetranychus tumidus and Tetranychus urticae (Acari: Tetranychidae) and the metabolite profile of Duguetia lanceolata (Annonaceae) using GC-MS." Semina: Ciências Agrárias 36, no. 6Supl2 (December 16, 2015): 4119. http://dx.doi.org/10.5433/1679-0359.2015v36n6sup2p4119.

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Species of the Tetranychus genus feed on plant tissues, which reduces the rate of photosynthesis and can lead to the death of plant tissues. As a result, considerable production losses are caused by these arthropods. Thus, in order to aid in the development of new products for the control of Tetranychus tumidus Banks and Tetranychus urticae Koch (Acari: Tetranychidae), the initial objective of this study was to select Annonaceae derived fractions that were soluble in dichloromethane and have acaricidal activity. Then, an exploratory analysis of the metabolite profile of the most successful fraction was performed by gas chromatography-mass spectrometry (GC-MS). Among the dichloromethane soluble fractions derived from Annona cacans Warm., Annona coriacea Mart., Annona neolaurifolia H. Rainer, Annona sylvatica A.St.-Hil., Duguetia lanceolata A.St.-Hil., Guatteria australis A.St.-Hil., Xylopia brasiliensis Spreng., Xylopia emarginata Mart. and Xylopia sericea A.St.-Hil., only the fraction from D. lanceolata stem bark reduced the survival of T. tumidus females. However, ovicidal activity was not detected when D. lanceolata stem bark was evaluated against T. tumidus eggs. Further, we studied the effect of dichloromethane soluble fractions from D. lanceolata leaves, berry fruits and stem bark on T. urticae, and the stem bark was found to be the most active fraction against T. urticae. The metabolite profile analysis of D. lanceolata stem bark by GC-MS, suggested that the main constituents were 2,4,5-trimethoxystyrene and trans-asarone.

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Rocha de Castro, Douglas Alberto, Haroldo Jorge da Silva Ribeiro, Lauro Henrique Hamoy Guerreiro, Lucas Pinto Bernar, Sami Jonatan Bremer, Marcelo Costa Santo, Hélio da Silva Almeida, Sergio Duvoisin, Luiz Eduardo Pizarro Borges, and Nélio Teixeira Machado. "Production of Fuel-Like Fractions by Fractional Distillation of Bio-Oil from Açaí (Euterpe oleracea Mart.) Seeds Pyrolysis." Energies 14, no. 13 (June 22, 2021): 3713. http://dx.doi.org/10.3390/en14133713.

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This work investigates the effect of production scales (laboratory, bench, and pilot) by pyrolysis of Açaí (Euterpe oleracea Mart.) seeds at 450 °C and 1.0 atmosphere, on the yields of reaction products and acid value of bio-oils. The experiments were carried out in batch mode using a laboratory scale reactor of 143 mL, a bench scale reactor of 1.5 L, and a pilot scale reactor of 143 L (≈1:10:1000). The bio-oil was obtained in pilot scale, fractionated by distillation to produce biofuel-like fractions. The distillation of bio-oil was carried out in a laboratory column. The physical-chemistry properties (density, kinematic viscosity, acid value, and refractive index) of bio-oils and distillation fractions were determined. The qualitative analysis was determined by FT-IR and the chemical composition by GC-MS. The pyrolysis showed bio-oil yields from 4.37 to 13.09 (wt.%), decreasing with reactor volume. The acid value of bio-oils varied from 68.31 to 70.26 mg KOH/g. The distillation of bio-oil produced gasoline, light kerosene, and kerosene-like fuel fractions, and the yields were 16.16, 19.56, and 41.89 (wt.%), respectively. The physical-chemistry properties of distillation fractions increase with temperature. The FT-IR analysis of bio-oils and distillation fractions identified the presence of functional groups characteristic of hydrocarbons (alkenes, alkanes, aromatics, and aromatics rings) and oxygenates (carboxylic acids, ketones, esters, ethers, alcohols, phenols). The GC-MS identified 48.24 (area.%) hydrocarbons and 51.76 (area.%) oxygenates in the bio-oil produced in bench scale and 21.52 (area.%) hydrocarbons and 78.48 (area.%) oxygenates in the bio-oil produced in pilot scale. The gasoline-like fraction was composed by 64.0 (area.%) hydrocarbons and 36.0 (area.%) oxygenates, light kerosene-like fraction by 66.67 (area.%) hydrocarbons and 33.33 (area.%) oxygenates, and kerosene-like fraction by 19.87 (area.%) hydrocarbons and 81.13 (area.%) oxygenates.

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Batista de Farias, Gabriela, Jean Lucas Da Silva Rodrigues, Maria Nilce De Sousa Ribeiro, Lyege Oliveira Magalhães, Antonio Gilberto Ferreira, and Maria Da Paz Lima. "Chemical constituent analysis of the Babassu (Orbignya phalerata Mart.) mesocarp." Universitas Scientiarum 24, no. 2 (July 22, 2019): 323–35. http://dx.doi.org/10.11144/javeriana.sc24-2.ccao.

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The Babassu nut (Orbignya phalerata Mart.) mesocarp is traditionally transformed to flour and consumed in some Brazilian areas for its attributed medicinal activity; however, its chemical properties remain to be elucidated. The present work aimed at analyzing the babassu mesocarp phytochemical constituents. Babassu nut samples were collected in the Brazilian Amazon, and their mesocarps were prepared and macerated in different solvents. The chromatographic fractionation of selected methanol extracts yielded three fractions, A-5, A-6, and B-1 that were characterized with high resolution methods. Fraction A-5 was characterized through GC/MS as a fatty acid mixture with predominance of eicosanoic (38.67 %) and 11-octadecanoic (21.71 %) acids. Fraction A-6 was characterized by the presence of three phytosteroids (32.02 %), sesquiterpene (nerolidol; 24.89 %), and diterpene (17-acetoxy-19-kauranal; 15.17 %). The 1H and 13C NMR spectra on fraction A-6 showed characteristic chemical shifts for its compounds. Compound B-1 was identified as ergostanol-3-benzoate based on NMR experiments in one and two dimensions. These results constitute the first identification of babassu mesocarp chemical constituents in 1 and 2-dimensions, paving the way to understanding its role in popular medicine.

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Rauber, Luiz Paulo, Andréia Patrícia Andrade, and Álvaro Luiz Mafra. "SOIL ORGANIC CARBON STOCKS IN GRANULOMETRIC FRACTIONS UNDER USE AND MANAGEMENT SYSTEMS WITH SWINE AND POULTRY MANURE." BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura 92, no. 2 (August 8, 2017): 101. http://dx.doi.org/10.37856/bja.v92i2.2648.

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Avaliou-se a influência do uso de dejetos de suínos e cama de aves sobre o conteúdo de carbono orgânico total (COT) e particulado (COP) e a sua distribuição nas frações granulométricas e em classes de agregados de um Nitossolo Vermelho Eutróférrico. As áreas analisadas foram milho para silagem (M7 anos); milho para silagem (M20 anos); pastagem de azevém (P3 anos); pastagem de azevém (P15 anos); pastagem perene (PP20 anos); erva mate (EM20 anos); mata nativa (MN) e pastagem nativa sem aplicação de dejetos (P0 anos). Os estoques de COT e COP foram maiores na área de mata nativa. A MN teve os maiores teores de C-agregados do que todos os tratamentos nas três classes de agregados avaliados, e M7 teve os menores teores. A aplicação de fertilizantes orgânicos de suínos e aves não aumentou os teores de carbono orgânico do solo.

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Bhatia, Parnika, Maël Delem, Jessica Léone, Esther Boisin, Anne Cheylus, Marie-Line Gardes, and Jérôme Prado. "The ratio processing system and its role in fraction understanding: Evidence from a match-to-sample task in children and adults with and without dyscalculia." Quarterly Journal of Experimental Psychology 73, no. 12 (July 22, 2020): 2158–76. http://dx.doi.org/10.1177/1747021820940631.

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It has been hypothesised that the human neurocognitive architecture may include a perceptual ratio processing system (RPS) that supports symbolic fraction understanding. In the present study, we aimed to provide further evidence for the existence of the RPS by exploring whether individuals with a range of math skills are indeed perceptually sensitive to non-symbolic ratio magnitudes. We also aimed to test to what extent the RPS may underlie symbolic fraction processing in those individuals. In a match-to-sample task, typical adults, elementary school children, and adults with dyscalculia were asked to match a non-symbolic ratio (i.e., target) to one of two non-symbolic ratios (i.e., the match and distractor). We found that all groups of participants were sensitive to the ratio between the match and the distractor, suggesting a common reliance on the RPS. This ratio sensitivity was also observed in another group of typical adults who had to choose which of two symbolic fractions match a non-symbolic ratio, indicating that the RPS may also contribute to symbolic fraction understanding. However, no ratio dependence was observed when participants had to choose which of two symbolic fractions match another symbolic fraction, suggesting that reliance on the RPS in symbolic fraction processing is limited and may not support exact fraction processing.

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Kaba, Yasemin. "The relationships between middle school students’ problem posing achievements and math problem solving attitudes: Fractions." New Trends and Issues Proceedings on Humanities and Social Sciences 4, no. 1 (August 26, 2017): 462–71. http://dx.doi.org/10.18844/prosoc.v4i1.2289.

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Adnan, Mazlini, Najah Mohd Nawi, Mohd Faizal Nizam Lee Abdullah, Che Nidzam Che Ahmad, and Nurul Syakirah Arifin. "Pembinaan item Kemahiran Berfikir Aras Tinggi Matematik Tingkatan Satu untuk topik Pecahan." Jurnal Pendidikan Sains Dan Matematik Malaysia 8, no. 1 (June 26, 2018): 46–54. http://dx.doi.org/10.37134/jpsmm.vol8.1.4.2018.

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Kemahiran Berfikir Aras Tinggi (KBAT) merupakan kemahiran yang amat penting untuk dikuasai oleh guru dan pelajar dalam meningkatkan tahap pendidikan negara di peringkat global. Kajian ini bertujuan untuk membina item (KBAT) mata pelajaran Matematik Tingkatan Satu untuk Topik Pecahan. Kesahan kandungan item KBAT yang dibina telah dibuat oleh 5 orang pakar. Pengesahan melibatkan kesesuaian item dan aras kognitif item. Sebanyak 20 item telah dipilih dan mendapat persetujuan pakar bahawa item tersebut menepati aras KBAT yang dirancang. Kesahan instrumen kajian pula ditentukan melalui kesahan muka, kandungan dan konstruk oleh 5 orang pakar. Kajian rintis telah dijalankan terhadap 15 orang guru mata pelajaran Matematik. Nilai pekali Alpha Cronbach adalah antara 0.812 dan 0.911. Bagi mengukur kebolehgunaan item KBAT, 32 orang responden yang terdiri daripada guru mata pelajaran Matematik di sekolah menengah kebangsaan sekitar Jajahan Kota Bharu. Analisis deskriptif menggunakan Perisian Statistical Package for Social Science (SPSS) dijalankan mendapati, untuk bahagian ‘Pengetahuan Berkaitan KBAT’, nilai min untuk setiap item adalah antara 3.6563 dan 4.5938. Bahagian ‘Kandungan Item KBAT’ pula, nilai min adalah antara 4.2188 dan 4.8750. Manakala bahagian ‘Kegunaan Praktikal Item KBAT’, nilai min yang diperolehi adalah antara 4.2500 dan 4.4375. Bahagian ‘Kualiti Item KBAT’ pula mencatat nilai min antara 4.1563 dan 4.5313. Dapatan ini menunjukkan bahawa item KBAT yang dibina mendapat persetujuan dan kesahan daripada pakar dan dapat digunakan dalam Pengajaran dan Pembelajaran (PdP) Topik Pecahan mata pelajaran Matematik.

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Mokashi, Neelima A. "Math Fair: Focus on Fractions." Teaching Children Mathematics 15, no. 9 (May 2009): 543–51. http://dx.doi.org/10.5951/tcm.15.9.0543.

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Stubits, M., J. Teng, and J. Pereira. "Characterization of Malt Grist Fractions." Journal of the American Society of Brewing Chemists 44, no. 1 (January 1986): 12–15. http://dx.doi.org/10.1094/asbcj-44-0012.

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Bottge, Brian A., Enrique Rueda, Timothy S. Grant, Ana C. Stephens, and Perry T. Laroque. "Anchoring Problem-Solving and Computation Instruction in Context-Rich Learning Environments." Exceptional Children 76, no. 4 (July 2010): 417–37. http://dx.doi.org/10.1177/001440291007600403.

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Middle school students with learning disabilities in math (MLD) used two versions of Enhanced Anchored Instruction (EAI). In one condition, students learned how to compute with fractions on an as-needed basis while they worked to solve the EAI problems. In the other condition, teachers used a computer-based instructional module in place of one of the EAI problems to deliver formal fraction instruction. The results indicated that students in both instructional formats improved their fraction computational skills and that formal instruction provided an added benefit. Both instructional conditions improved students' problem-solving skills by about the same amount. The findings suggest that combining formal fraction instruction with EAI is a viable way to improve the problem-solving and computational skills of students with MLD.

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Ho, Pak Tung, and Rong Tang. "Fractional Yamabe solitons and fractional Nirenberg problem." Communications on Pure & Applied Analysis 20, no. 9 (2021): 3215. http://dx.doi.org/10.3934/cpaa.2021103.

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In this paper, we first study the fractional Yamabe solitons, which are the self-similar solutions to fractional Yamabe flow.We prove some rigidity results and Liouville type results for such solitons.We thenconsider the fractional Nirenberg problem:the problem of prescribing fractional order curvature on the sphere.More precisely, we prove that there exists a conformal metric on the unit sphere such that itsfractional order curvature is <inline-formula><tex-math id="M1">\begin{document}$ f $\end{document}</tex-math></inline-formula>, when <inline-formula><tex-math id="M2">\begin{document}$ f $\end{document}</tex-math></inline-formula> possesses certain reflection or rotation symmetry.

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Balci, Mehmet Ali. "Fractional virus epidemic model on financial networks." Open Mathematics 14, no. 1 (January 1, 2016): 1074–86. http://dx.doi.org/10.1515/math-2016-0098.

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AbstractIn this study, we present an epidemic model that characterizes the behavior of a financial network of globally operating stock markets. Since the long time series have a global memory effect, we represent our model by using the fractional calculus. This model operates on a network, where vertices are the stock markets and edges are constructed by the correlation distances. Thereafter, we find an analytical solution to commensurate system and use the well-known differential transform method to obtain the solution of incommensurate system of fractional differential equations. Our findings are confirmed and complemented by the data set of the relevant stock markets between 2006 and 2016. Rather than the hypothetical values, we use the Hurst Exponent of each time series to approximate the fraction size and graph theoretical concepts to obtain the variables.

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Merdivan, Simon, Kristina Jenett-Siems, Karsten Siems, Timo H. J. Niedermeyer, Nadin Schultze, Carmen Steinborn, Carsten Gründemann, and Ulrike Lindequist. "Effects of extracts and compounds from Tricholoma populinum Lange on degranulation and IL-2/IL-8 secretion of immune cells." Zeitschrift für Naturforschung C 72, no. 7-8 (July 14, 2017): 277–83. http://dx.doi.org/10.1515/znc-2016-0247.

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Abstract:Tricholoma populinumLange is an edible basidiomycete from the family Tricholomataceae. Extracts, fractions, and different metabolites isolated from the fruiting bodies of this mushroom were tested for degranulation-inhibiting activities on RBL-2H3 cells (rat basophils). Dichloromethane extracts decreased degranulation significantly, as did a fraction after column chromatography. In addition, the extract decreased the IL-2 release from Jurkat T cells and the release of IL-8 from HMC-1 human mast cells. The results show the significant effects of extracts ofT. populinumon cells of the innate (basophils and mast cells) and adaptive (T cells) immune system and indicate the influence of the mushroom on different immunological processes. As one fraction showed activity, it seems to be possible that it includes an active principle. The compounds responsible for this effect, however, could not be identified as the contents oleic acid (1), ergosterol peroxide (2), and 9,11-dehydroergosterol peroxide (3) showed no effects. Nevertheless, the mushroom could be used for supporting allergy treatment in future studies.

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Xhaferri, Emiriana, Ruben Corijn, Agim Sinojmeri, Rudy Swennen, and Çerçis Durmishi. "Study of Heavy Minerals from the Vjosa and Mati river delta sediments in Albania." Bulletin of the Geological Society of Greece 56, no. 1 (November 16, 2020): 223. http://dx.doi.org/10.12681/bgsg.22989.

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This research is focused on the determination of the heavy minerals (HM) load of the Vjosa and Mati river delta deposits along the Albanian coastline and it is based on X-ray Diffractometry. The Albanian coastline consists of sandy beaches at the north (Adriatic coastline) and rocky escarpments at the south (Ionian coastline). Several layers of heavy mineral deposits, up to 50 cm thick, with heavy mineral fraction up to 95% and 88% of total sample for Vjosa and Mati sediments respectively, are identified. The layers enriched in heavy minerals from Vjosa delta deposits are almost black in colour, while at Mati delta these layers are dark green coloured. Separation of the heavy from the light fraction was performed, in order to compare the different fractions between the two studied delta areas. The accumulation of HM occurs mainly in the fraction of 125-250 µm in the sediments of both deltas. The HM dominate in the magnetic field of 0.4-0.8 A/m. XRD analysis results show a great variety of minerals present in the delta samples which can be attributed to the wide variety of geological zones and lithologies that are intersected by the Vjosa and Mati rivers, respectively. In the 63-425 μm fraction rich in heavy minerals of both delta systems considerable amounts of magnetite (up to 39.4% in Vjosa samples), chromite (up to 20.2% in Vjosa samples), garnet (up to 13.6% in Vjosa samples), ilmenite (up to 8.3% in Mati samples), rutile (up to 4.7% in Mati samples), hematite (up to 2.2% in Mati samples), and zircon (up to 2.1% in Vjosa samples) are observed. Rock forming minerals such as pyroxene, amphibole, and epidote compose significant percentages of this fraction. In addition, the presence of gold grains in Vjosa delta sediments is remarkable. Both catchment areas consist to a great extent of similar formations such as the Mirdita Ophiolite Zone and the Pindos Ophiolite complex, providing thus a similar HM fingerprint at both delta areas. Minerals that occur in higher abundances reflect the extensive presence in the drained areas of related parent rocks which are rich in these minerals and which are often more vulnerable to weathering. The samples of Vjosa river delta show high percentage of carbonate constituents, which is related to the presence of carbonate rocks of the Ionian and Kruja tectonic zones within which the hydrographic network of the Vjosa River has been developed. The samples of Mati river delta show lower abundance of carbonate minerals, reflecting the limited presence of carbonate rocks at the Kruja Zone, which occur in the catchment area of the river near its mouth.

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Morimont, Philippe, Bernard Lambermont, Julien Guiot, Vincent Tchana Sato, Christophe Clotuche, Jonathan Goffoy, and Jean-Olivier Defraigne. "Ejection Fraction May Not Reflect Contractility." ASAIO Journal 64, no. 4 (2018): e68-e71. http://dx.doi.org/10.1097/mat.0000000000000661.

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Lim, Hoong Sern. "The Physiologic Basis of Ejection Fraction." ASAIO Journal 65, no. 6 (August 2019): e63. http://dx.doi.org/10.1097/mat.0000000000000899.

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Banks, William D., and Igor E. Shparlinski. "Fractional parts of Dedekind sums." International Journal of Number Theory 12, no. 05 (May 10, 2016): 1137–47. http://dx.doi.org/10.1142/s179304211650069x.

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Using a recent improvement by Bettin and Chandee to a bound of Duke, Friedlander and Iwaniec [Bilinear forms with Kloosterman fractions, Invent. Math. 128 (1997) 23–43] on double exponential sums with Kloosterman fractions, we establish a uniformity of distribution result for the fractional parts of Dedekind sums [Formula: see text] with [Formula: see text] and [Formula: see text] running over rather general sets. Our result extends earlier work of Myerson [Dedekind sums and uniform distribution, J. Number Theory 28 (1988) 233–239] and Vardi [A relation between Dedekind sums and Kloosterman sums, Duke Math. J. 55 (1987) 189–197]. Using different techniques, we also study the least denominator of the collection of Dedekind sums [Formula: see text] on average for [Formula: see text].

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Xiao, Xing-cai, Xu-ri Huang, Ze-sheng Li, Chia-chung Sun, and Au-chin Tang. "The sol fraction and conversions in AaBb type polymerisation." Macromolecular Theory and Simulations 4, no. 6 (November 1995): 1055–61. http://dx.doi.org/10.1002/mats.1995.040040604.

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Cárdenas-Torres, Feliznando Isidro, Cuauhtémoc Reyes-Moreno, Marcela de Jesús Vergara-Jiménez, Edith Oliva Cuevas-Rodríguez, Jorge Milán-Carrillo, Roberto Gutiérrez-Dorado, Jesús Gilberto Arámburo-Gálvez, Noé Ontiveros, and Francisco Cabrera-Chávez. "Assessing the Sensitizing and Allergenic Potential of the Albumin and Globulin Fractions from Amaranth (Amaranthus hypochondriacus) Grains before and after an Extrusion Process." Medicina 55, no. 3 (March 20, 2019): 72. http://dx.doi.org/10.3390/medicina55030072.

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Background: The first cases of food allergy to amaranth grain have recently been published. This pseudocereal is considered hypoallergenic, and there is scarce information about the allergenic potential of amaranth proteins, either before or after food processing. Objective: To evaluate, in a mouse model of food allergy, the sensitizing and allergenic potential of extruded and non-extruded albumin and globulin fractions from amaranth grains. Materials and Methods: Amaranth (Amaranthus hypochondriacus) flour was obtained and the albumin and globulin fractions isolated. These protein fractions were also obtained after flour extrusion. An intraperitoneal 28-day protocol was carried out to evaluate the sensitizing and allergenic potential of the proteins. The common and rarely allergenic proteins ovalbumin and potato acidic phosphatase were utilized as reference. Specific IgE and IgG antibodies were evaluated for all the proteins tested. Mast cell protease-1 (mMCP-1) responses were evaluated in serum samples collected after intragastric challenges with the proteins of interest. All serological evaluations were carried out using ELISA. Results: Mice were sensitized to the non-extruded albumin fraction from amaranth grains and to ovalbumin (p = 0.0045). The extrusion process of amaranth proteins abrogated the IgE responses triggered under non-extruded conditions (p = 0.0147). mMCP-1 responses were significantly detected in the group of mice sensitized to ovalbumin (p = 0.0138), but not in others. Conclusions: The non-extruded albumin fraction from amaranth has the potential to sensitize BALB/c mice, but this sensitizing potential fails to induce detectable serum levels of the mast cell degranulation marker mMCP-1 after intragastric challenges. Furthermore, the extrusion process abolished the sensitization potential of the amaranth albumins.

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Norton, Anderson H., and Andrea V. McCloskey. "Modeling Students' Mathematics Using Steffe's Fraction Schemes." Teaching Children Mathematics 15, no. 1 (August 2008): 48–54. http://dx.doi.org/10.5951/tcm.15.1.0048.

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Each year, more teachers learn about the successful intervention program known as Math Recovery (USMRC 2008; Wright 2003). The program uses Steffe's whole-number schemes to model, understand, and support children's development of whole-number reasoning. Readers are probably less familiar with Steffe's fraction schemes, which have proven similarly useful in supporting children's development of fractional reasoning. The purpose of this article is to introduce some of these schemes. We provide examples of student work accompanied by discussions of how fraction schemes can be used as tools for insight into student reasoning. We hope that teachers will find the schemes useful in understanding their students as mathematicians.

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Istiqomah, Ariningtyas Priyahita, Danang Junaedi, and Emil Robert Kaburuan. "Designing user interface on monopoly game application for learning fraction in elementary school by using goal directed design method." MATEC Web of Conferences 197 (2018): 16009. http://dx.doi.org/10.1051/matecconf/201819716009.

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Learning achievement is a measure of success after following the learning process. While the mathematics learning achievement of 5th grade elementary school students is low, as evidenced by the daily recapitulation data value of students who still score below the Minimum Exhaustiveness Criteria. According to the teacher the cause is the number of students who have not mastered the fraction material as the basis of mathematics material taught in class 5. So that required handling to achieve optimal results. According to research by Elvi Mailani, the Monopoly game used as a fractional math learning tool for elementary school children can have a positive impact by training children to hone their skills. But in this study, the media used less effective because it requires special handling to achieve goals and more optimal results. Based on these problems, a model of user interface for prototype application of fractional math monopoly game for elementary school students was designed. The goal directed design method is used as a design method that focuses on user goals. Based on the result of usability evaluation for the user interface model using QUIM obtained a percentage of 91.56%. So that the user interface model has fulfilled the usability element as a learning fraction media in Elementary school.

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Kërënxhi, Svjetllana, and Pranvera Gjoci. "Involvement of Algebraic-Geometrical Duality in Shaping Fraction’s Meaning and Calculation Strategies with Fractions." Journal of Educational and Social Research 7, no. 1 (January 26, 2017): 151–57. http://dx.doi.org/10.5901/jesr.2017.v7n1p151.

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Abstract Many mathematical concepts and processes, besides the algebraic form of their presentation, can be modeled as well geometrically through diagrams and graphics. Both these aspects of concepts demonstration (algebraic and geometrical aspect) are present on mathematical textbooks of pre-university education. In this paper we consider algebraic and geometrical aspect on 6th grade math textbooks and in particular algebraic-geometrical duality, aiming that the fraction concept and the fraction calculation strategy to be assimilated better by the students. A study was made with 78 students to understand their abilities to express using algebraic symbols and to introduce mathematical situations with geometrical models for “Fractions” chapter. After the analysis of calculative strategies applied by students, in the article it is suggested that algebraic-geometrical duality must be included in teaching based on a complete framework. This will enable students to fully realize the deep understanding of concepts and the calculative strategies they are using.

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Chuang, S.-S., AW Chiu, H. Liu, H. Ye, and MQ Du. "Primary urethral MALT lymphoma with high proliferation fraction." Histopathology 46, no. 6 (June 2005): 714–15. http://dx.doi.org/10.1111/j.1365-2559.2005.02033.x.

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Mohammadian, S., Y. Mahmoudi, and F. D. Saei. "Solution of fractional telegraph equation with Riesz space-fractional derivative." AIMS Mathematics 4, no. 6 (2019): 1664–83. http://dx.doi.org/10.3934/math.2019.6.1664.

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Hussain, Aftab. "Fractional convex type contraction with solution of fractional differential equation." AIMS Mathematics 5, no. 5 (2020): 5364–80. http://dx.doi.org/10.3934/math.2020344.

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Li, Ze-sheng, Xin-wu Ba, Chia-chung Sun, and Au-chin Tang. "On the sol fraction of Aa1 Bb1−Aa2 Bb2 copolymerisations." Die Makromolekulare Chemie, Theory and Simulations 2, no. 3 (May 1993): 371–75. http://dx.doi.org/10.1002/mats.1993.040020307.

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Kreuml, Andreas, and Olaf Mordhorst. "Fractional perimeters on the sphere." Discrete & Continuous Dynamical Systems 41, no. 11 (2021): 5439. http://dx.doi.org/10.3934/dcds.2021083.

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This note treats several problems for the fractional perimeter or <inline-formula><tex-math id="M1">\begin{document}$ s $\end{document}</tex-math></inline-formula>-perimeter on the sphere. The spherical fractional isoperimetric inequality is established. It turns out that the equality cases are exactly the spherical caps. Furthermore, the convergence of fractional perimeters to the surface area as <inline-formula><tex-math id="M2">\begin{document}$ s \nearrow 1 $\end{document}</tex-math></inline-formula> is proven. It is shown that their limit as <inline-formula><tex-math id="M3">\begin{document}$ s \searrow -\infty $\end{document}</tex-math></inline-formula> can be expressed in terms of the volume.

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Veeresha, P., D. G. Prakasha, and Jagdev Singh. "Solution for fractional forced KdV equation using fractional natural decomposition method." AIMS Mathematics 5, no. 2 (2020): 798–810. http://dx.doi.org/10.3934/math.2020054.

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de Vries, P., K. A. Brasel, J. R. Eisenman, A. R. Alpert, and D. E. Williams. "The effect of recombinant mast cell growth factor on purified murine hematopoietic stem cells." Journal of Experimental Medicine 173, no. 5 (May 1, 1991): 1205–11. http://dx.doi.org/10.1084/jem.173.5.1205.

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Pluripotent hematopoietic stem cells (PHSC) are very rare cells whose functional capabilities can only be analyzed indirectly. For a better understanding and possible manipulation of mechanisms that regulate self-renewal and commitment to differentiation of PHSC, it is necessary to purify these cells and to develop assays for their growth in vitro. In the present study, a rapid and simple, widely applicable procedure to highly purify day 14 spleen colony-forming cells (day 14 CFU-S) is described. Low density bone marrow cells (rho less than or equal to 1.078 g/cm3) were enriched by two successive light-activated cell sorting procedures. In the first sort, cells within a predetermined light scatter (blast cell) window that are wheat germ agglutinin/Texas Red (WGA/TxR) positive and mAb 15-1.4.1/fluorescein isothiocyanate negative (granulocyte-monocyte marker) were selected. In the second sort, cells were selected on the basis of retention of the supravital dye rhodamine 123 (Rh123). Cells that take up little Rh123 (Rh123 dull cells) and those that take up more Rh123 (Rh123 bright cells) were 237-fold and 132-fold enriched, respectively, for day 14 CFU-S. Both Rh123 fractions were cultured for various time periods in vitro in the presence of mast cell growth factor (MGF), with or without interleukin 3 (IL-3) or IL-1 alpha. Both Rh123 fractions proliferated in response to MGF alone as determined by a [3H]TdR assay or by counting nucleated cells present in the cultures over time. MGF also acted synergistically with both IL-3 and IL-1 alpha to promote stem cell proliferation. Stimulation of both Rh123 fractions with MGF alone did not result in a net increase of day 14 CFU-S. Stimulation with MGF + IL-3 or MGF + IL-alpha resulted in a 4.4- or 2.6-fold increase of day 14 CFU-S in the Rh123 dull fraction, and an 11.6-fold or 2.6-fold increase of day 14 CFU-S in the Rh123 bright fraction, respectively. The data presented in this paper indicate that in vitro MGF acts on primitive hematopoietic stem cells by itself and also is a potent synergistic factor in combination with IL-3 or IL-1 alpha.

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Fusi, A., A. Busse, S. Ochsenreither, A. Rietz, and U. Keilholz. "Expression of stem cell markers in circulating melanoma cells." Journal of Clinical Oncology 27, no. 15_suppl (May 20, 2009): e22056-e22056. http://dx.doi.org/10.1200/jco.2009.27.15_suppl.e22056.

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e22056 Background: Within circulating tumor cells there may be a subset of cell with stem cell (tumor initiating) characteristics able to develop distant metastasis. Several markers including nestin and CD133 have been found to be possible candidates to identify such a kind of subpopulation in other experimental models. We evaluated the presence of melanoma cells bearing stem cell phenotype in the bloodstream of patients with cutaneous or uveal melanoma after depletion of the leukocytes fraction. Methods: Between 50 and 100 ml of peripheral blood were collected from 12 melanoma patients with various tumor burden as well as three healthy volunteers. Blood samples were enriched for tumour cells by CD45 depletion of the leukocyte fraction using magnetic beads separation (EasySep, Stem Cell Technologies. Inc.). The remaining material was stained with antibodies for the markers Melan-A/Mart-1 (Dako) and HMB45 (Dako), CD133 (Miltenyi Biotec) and nestin (R&D System) and analysed by flow cytometry (BD FACSCalibur). Ten ml of blood were further processed and CD133, nestin, Melan-A/Mart-1 transcripts were quantified by Real Time RT-PCR (LightCycler, Roche Diagnostic). Results: CD45-depleted fractions in healthy controls were negative for melanoma markers. Melan-A/Mart-1 and/or HMB45 positive cells were detectable in 11 out of 12 melanoma patients. The absolute number of melanoma cells identified ranged from 6 to 176 per 10 ml of blood. Nestin expressing cells were more represented compared to CD133 expressing cells (median 27.4%, range 0.3% to 65.1% vs. median 9.3%, range 0.1% to 16.8%) within the melanoma fraction of cells positive for Melan-A/Mart-1 and/or HMB45. In one patient two different melanoma cell populations were detectable. The population of cells with lower expression of the melanoma markers showed at the same time higher expression of nestin and CD133 (5.9% vs. 1.3% and 10.2% vs. 6.7% respectively). Nestin results were in good accordance to the FACS data (nestin: r=0.55; CD133: r=0.23; Pearson test). Conclusions: The novel negative separation technique allows reliable isolation of melanoma cells from peripheral blood of patients with metastatic disease. A significant fraction of melanoma cells in peripheral blood bears a stem cell phenotype. No significant financial relationships to disclose.

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Morimont, Philippe, and Bernard Lambermont. "Left Ventricular Ejection Fraction Depends on Loading Conditions." ASAIO Journal 65, no. 6 (August 2019): e64. http://dx.doi.org/10.1097/mat.0000000000000900.

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Alves, Dejane Santos, Reinaldo Chico Morejón, Alan Rodrigues Teixeira Machado, Geraldo Andrade Carvalho, Oriela Pina, and Denilson Ferreira Oliveira. "Acaricidal activity of Annonaceae fractions against Tetranychus tumidus and Tetranychus urticae (Acari: Tetranychidae) and the metabolite profile of Duguetia lanceolata (Annonaceae) using GC-MS." Semina: Ciências Agrárias 36, no. 6Supl2 (December 16, 2015): 4119. http://dx.doi.org/10.5433/1679-0359.2015v36n6supl2p4119.

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Species of the Tetranychus genus feed on plant tissues, which reduces the rate of photosynthesis and can lead to the death of plant tissues. As a result, considerable production losses are caused by these arthropods. Thus, in order to aid in the development of new products for the control of Tetranychus tumidus Banks and Tetranychus urticae Koch (Acari: Tetranychidae), the initial objective of this study was to select Annonaceae derived fractions that were soluble in dichloromethane and have acaricidal activity. Then, an exploratory analysis of the metabolite profile of the most successful fraction was performed by gas chromatography-mass spectrometry (GC-MS). Among the dichloromethane soluble fractions derived from Annona cacans Warm., Annona coriacea Mart., Annona neolaurifolia H. Rainer, Annona sylvatica A.St.-Hil., Duguetia lanceolata A.St.-Hil., Guatteria australis A.St.-Hil., Xylopia brasiliensis Spreng., Xylopia emarginata Mart. and Xylopia sericea A.St.-Hil., only the fraction from D. lanceolata stem bark reduced the survival of T. tumidus females. However, ovicidal activity was not detected when D. lanceolata stem bark was evaluated against T. tumidus eggs. Further, we studied the effect of dichloromethane soluble fractions from D. lanceolata leaves, berry fruits and stem bark on T. urticae, and the stem bark was found to be the most active fraction against T. urticae. The metabolite profile analysis of D. lanceolata stem bark by GC-MS, suggested that the main constituents were 2,4,5-trimethoxystyrene and trans-asarone.

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Forestieri, Sara D., Gavin C. Cornwell, Taylor M. Helgestad, Kathryn A. Moore, Christopher Lee, Gordon A. Novak, Camille M. Sultana, et al. "Linking variations in sea spray aerosol particle hygroscopicity to composition during two microcosm experiments." Atmospheric Chemistry and Physics 16, no. 14 (July 22, 2016): 9003–18. http://dx.doi.org/10.5194/acp-16-9003-2016.

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Abstract. The extent to which water uptake influences the light scattering ability of marine sea spray aerosol (SSA) particles depends critically on SSA chemical composition. The organic fraction of SSA can increase during phytoplankton blooms, decreasing the salt content and therefore the hygroscopicity of the particles. In this study, subsaturated hygroscopic growth factors at 85 % relative humidity (GF(85 %)) of predominately submicron SSA particles were quantified during two induced phytoplankton blooms in marine aerosol reference tanks (MARTs). One MART was illuminated with fluorescent lights and the other was illuminated with sunlight, referred to as the "indoor" and "outdoor" MARTs, respectively. Optically weighted GF(85 %) values for SSA particles were derived from measurements of light scattering and particle size distributions. The mean optically weighted SSA diameters were 530 and 570 nm for the indoor and outdoor MARTs, respectively. The GF(85 %) measurements were made concurrently with online particle composition measurements, including bulk composition (using an Aerodyne high-resolution aerosol mass spectrometer) and single particle (using an aerosol time-of-flight mass spectrometer) measurement, and a variety of water-composition measurements. During both microcosm experiments, the observed optically weighted GF(85 %) values were depressed substantially relative to pure inorganic sea salt by 5 to 15 %. There was also a time lag between GF(85 %) depression and the peak chlorophyll a (Chl a) concentrations by either 1 (indoor MART) or 3-to-6 (outdoor MART) days. The fraction of organic matter in the SSA particles generally increased after the Chl a peaked, also with a time lag, and ranged from about 0.25 to 0.5 by volume. The observed depression in the GF(85 %) values (relative to pure sea salt) is consistent with the large observed volume fractions of non-refractory organic matter (NR-OM) comprising the SSA. The GF(85 %) values exhibited a reasonable negative correlation with the SSA NR-OM volume fractions after the peak of the blooms (i.e., Chl a maxima); i.e., the GF(85 %) values generally decreased when the NR-OM volume fractions increased. The GF(85 %) vs. NR-OM volume fraction relationship was interpreted using the Zdanovskii–Stokes–Robinson (ZSR) mixing rule and used to estimate the GF(85 %) of the organic matter in the nascent SSA. The estimated pure NR-OM GF(85 %) values were 1.16 ± 0.09 and 1.23 ± 0.10 for the indoor and outdoor MARTS, respectively. These measurements demonstrate a clear relationship between SSA particle composition and the sensitivity of light scattering to variations in relative humidity. The implications of these observations to the direct climate effects of SSA particles are discussed.

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Nygren, Eeva, Erkki Sutinen, A. Seugnet Blignaut, Teemu H. Laine, and Christo J. Els. "Motivations for Play in the UFractions Mobile Game in Three Countries." International Journal of Mobile and Blended Learning 4, no. 2 (April 2012): 30–48. http://dx.doi.org/10.4018/jmbl.2012040103.

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UFractions (Ubiquitous fractions) is a storytelling mobile game that utilizes fraction rods in solving real life related math problems. The prototype of UFractions was tested during the period March 2009 to May 2011 in South Africa, Finland, and Mozambique amongst 279 players, ranging in age from 10 to 32, the majority being grade eight students. A multi-method approach, comprising of both qualitative and quantitative data collection strategies, was employed to develop a trans-cultural taxonomy for play motivation in mobile games, as observed in the evaluation of UFractions, i.e., altruism, challenge, cognitive restlessness, curiosity, fantasy, relations, and technology.

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Dahl, Alexander, and Vítězslav Kala. "Distribution of Class Numbers in Continued Fraction Families of Real Quadratic Fields." Proceedings of the Edinburgh Mathematical Society 61, no. 4 (August 20, 2018): 1193–212. http://dx.doi.org/10.1017/s0013091518000159.

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AbstractWe construct a random model to study the distribution of class numbers in special families of real quadratic fields ${\open Q}(\sqrt d )$ arising from continued fractions. These families are obtained by considering continued fraction expansions of the form $\sqrt {D(n)} = [f(n),\overline {u_1,u_2, \ldots ,u_{s-1} ,2f(n)]} $ with fixed coefficients u1, …, us−1 and generalize well-known families such as Chowla's 4n2 + 1, for which analogous results were recently proved by Dahl and Lamzouri [‘The distribution of class numbers in a special family of real quadratic fields’, Trans. Amer. Math. Soc. (2018), 6331–6356].

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Özer, Özen. "Fundamental units for real quadratic fields determined by continued fraction conditions." AIMS Mathematics 5, no. 4 (2020): 2899–908. http://dx.doi.org/10.3934/math.2020187.

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Liu, Xiping, Mei Jia, and Zhanbing Bai. "Nonlocal problems of fractional systems involving left and right fractional derivatives at resonance." AIMS Mathematics 5, no. 4 (2020): 3331–45. http://dx.doi.org/10.3934/math.2020214.

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Journal articles on the topic 'Matt Fraction'

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